Pneumatic elevator



(No Model.)

J.- MABBS. PNEUMATIG ELEVATOR.

Patented Jan. 11

Linn

.M W ,1m W J@ PATENT UFFICE.

JOHN MABBs, or CHICAGO, ILLINOIS.

PNEUMAT|C ELEVATOR. i'

SPECIFICATION forming parl; of Letters Patent No. 355,697, datedJanuary' 11, 1887.

Application filed August 5, 1886.

To all whom, it 71mg/ concern.:

Be itV known that I, JOHN MABBS, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and Improved Pneumatic Passenger-Elevator, of which thefollowing is a specilication.

My invention applies more particularly to passenger-elevators, but isapplicable to any kind. f

The object of my invention is to prevent the possibility of theelevator-car falling and cans.

ing such terrible frights andl great loss of life and limb as areconstantly occurring in connect1on with elevators now in use, where thecar vdepends for its support upon ropes, cables,

screws, pulleys, racks and pinions. or any mechanical'dcvice whatsoever,which are. liable to inherent weaknesses, subject to constant wear, andliable to breakagewith such terrible results'. I attain this object byapplying kthe power, compressed air, which is supplied by a blower orair compressor through a pipe/or passage at the bottom of the air tightelevatorshaft, directly to the car itself without anyintermediate devicewhatsoever, causing the car to ascend or float upon the air, whichcannot escape, as the car kfits the shaft air-tight, and all openingsare provided with air-tight doors and automatic valves. So the carascends or descends, at the will of the conductor, simply* by retainingor allowing the air to escape by closing or opening the operating-valvein the car.

The accompanying drawing illustrates the device and application.

A A is the air-tight elevatorshaft.

B is the elevator-car, made to fit the shaft air tight.

stantially as described.

Serial No. 210,132. (No model.) s

Vare impossible to be opened from the outside.

I am aware that'prior to my invention compressed air has been used asthe motive power for elevators, by meansy of cylinders, cables,sheave-wheels,and other intermediate devices. I therefore make no claimto the use of compressed air as a motive power for elevators; but

I What I do claim as my invention, and desire to secure by LettersPatent, is* 6o l. The combination, with an elevator-shaft having directconnection at its lower end with air-compressing mechanism,of anelevator-car fitting andeinoving in said shaft and an airpassage-carriedthrough said car and discharging into the shaft above the same,substantially as described.

2. The combination, with an elevator-shaft having connection at itslower end with a flue, C, for compressed air, of a car, B, fitting andmoving in said shaft, an air passage or tube, E, passing through the carand opening below and above it, and a shutoff or valve, F, subL JOHNManns.

Witnesses: J. W. MABBs,

ROBT. S. WORTHINGTON.

